Page 1 of 2 12 LastLast
Results 1 to 10 of 17

Thread: Battery drains like crazy on Linux

  1. #1
    Join Date
    Dec 2010
    Location
    Belgium, Europe
    Posts
    192

    Default Battery drains like crazy on Linux

    openSUSE appears to be using a lot more battery juice than my Windows 7 install. If I can use KDE's power management as an indicator, the battery load drops by 1% every three minutes or so.

    That's a little too much for me. How can I reduce my battery usage?

    Here are some PowerTop statistics:



    I've followed some of PowerTop's suggestions to reduce power savings, but they don't seem to have any significant effect. I haven't dug into PowerTop that much, so I have some trouble interpreting these statistics.

    It also caused my wireless keyboard (which is normally not connected to my laptop when on battery) to go to sleep mode and I have to hold a key for five seconds before Linux sees that the keyboard has started sending input. So basically I have to wait five seconds before I can type. The problem seems to have gone away after disconnecting/reconnecting the USB dongle for the keyboard though.

  2. #2
    Join Date
    Jun 2008
    Location
    West Yorkshire, UK
    Posts
    3,093

    Default Re: Battery drains like crazy on Linux

    I have the opposite experience with Linux more frugal than Windows; have you tried changing the power management settings in KDE?

  3. #3
    Join Date
    Jul 2009
    Location
    Calgary Alberta Canada
    Posts
    1,190

    Default Re: Battery drains like crazy on Linux

    Check your power management settings under KDE as suggested above. It would appear you are not optimized for battery operation. Normally, the battery should last much longer under linux than windows 7 as linux doesn't do the repetitive hdd rewrites that win 7 does. You might also check that your laptop is set to use internal lcd only as if it is set to external monitor plus lcd you will encounter twice as fast battery drain or higher.
    When your up to your a** in Alligators it's pretty hard to remember you intended to drain the swamp (author unknown)

  4. #4
    Join Date
    Dec 2010
    Location
    Belgium, Europe
    Posts
    192

    Default Re: Battery drains like crazy on Linux

    Quote Originally Posted by john_hudson View Post
    I have the opposite experience with Linux more frugal than Windows; have you tried changing the power management settings in KDE?
    I have changed some settings such as screen brightness, but most other settings are still set to default. Do you notice anything odd here?

    http://i.imgur.com/z0DBv.png
    http://i.imgur.com/g1Szj.png
    http://i.imgur.com/SGx3P.png
    http://i.imgur.com/VY3g3.png
    http://i.imgur.com/NOm4W.png
    http://i.imgur.com/abp0Y.png

  5. #5
    Join Date
    Jun 2008
    Location
    West Yorkshire, UK
    Posts
    3,093

    Default Re: Battery drains like crazy on Linux

    The only significant differences are that you have four CPUs and I have one and I don't use suspend to disk - but I don't know whether they would account for your different experience.

  6. #6
    Will Honea NNTP User

    Default Re: Battery drains like crazy on Linux

    techwiz03 wrote:

    >
    > Check your power management settings under KDE as suggested above. It
    > would appear you are not optimized for battery operation. Normally, the
    > battery should last much longer under linux than windows 7 as linux
    > doesn't do the repetitive hdd rewrites that win 7 does. You might also
    > check that your laptop is set to use internal lcd only as if it is set
    > to external monitor plus lcd you will encounter twice as fast battery
    > drain or higher.


    If I may tag on a related question:

    If I "Disable" the TV1 display in krandr, does this accomplish turning off
    the external output device or do I need to set the BIOS option to "internal
    LCD only" to actually kill the secondary display circuitry to realize the
    power saving?

    --
    Will Honea

  7. #7
    Join Date
    Jul 2009
    Location
    Calgary Alberta Canada
    Posts
    1,190

    Default Re: Battery drains like crazy on Linux

    Quote Originally Posted by Will Honea View Post
    techwiz03 wrote:

    >
    > Check your power management settings under KDE as suggested above. It
    > would appear you are not optimized for battery operation. Normally, the
    > battery should last much longer under linux than windows 7 as linux
    > doesn't do the repetitive hdd rewrites that win 7 does. You might also
    > check that your laptop is set to use internal lcd only as if it is set
    > to external monitor plus lcd you will encounter twice as fast battery
    > drain or higher.


    If I may tag on a related question:

    If I "Disable" the TV1 display in krandr, does this accomplish turning off
    the external output device or do I need to set the BIOS option to "internal
    LCD only" to actually kill the secondary display circuitry to realize the
    power saving?

    --
    Will Honea
    Many laptops have a hotkey designed to direct to lcd, external, or both. All you should need to do is get it into lcd mode. At least my last 5 toshiba's last two hp's and one of my last 2 compaq's worked this way. It is not always the case though as one of my last compaq's had to be done in bios and 3 acers I tried didn't have a way to shut off external display power at all.
    When your up to your a** in Alligators it's pretty hard to remember you intended to drain the swamp (author unknown)

  8. #8
    Join Date
    Dec 2010
    Location
    Belgium, Europe
    Posts
    192

    Default Re: Battery drains like crazy on Linux

    Quote Originally Posted by john_hudson View Post
    The only significant differences are that you have four CPUs and I have one and I don't use suspend to disk - but I don't know whether they would account for your different experience.
    Is there a way to collect consumption data from these four CPUs and see if it makes a difference? Or perhaps I could enable some feature that shuts down other CPUs when their task load doesn't justify their power usage?

  9. #9
    Join Date
    Aug 2008
    Location
    Brazil
    Posts
    2,114

    Default Re: Battery drains like crazy on Linux

    Quote Originally Posted by pdedecker View Post
    Or perhaps I could enable some feature that shuts down other CPUs when their task load doesn't justify their power usage?
    AFAIK that is not possible due to how windows distribute tasks (it rotates trough the cores). AMD processors had this capability, which worked well with linux, but gave a performance hit when used with windows (the SO would wake the sleeping processors to use then, slowing the processing), so AMD dropped this.

    I read the above some time ago, so things may have changed, although I don't think so.

  10. #10
    Join Date
    Aug 2008
    Location
    Brazil
    Posts
    2,114

    Default Re: Battery drains like crazy on Linux

    P.S.: On a relatively old HP pavillion I have here, the battery duration in vista (when it was installed) and oS was about the same, back when I tested it.

Page 1 of 2 12 LastLast

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •